rebuild time
Lead Driver
Joined: Mar 2004
Posts: 8,924
Likes: 153
What ever block you choose check the align bore out real close with a good bore gauge. The condition of it might influence which one you use. If I change pistons I always rebalance it. Nothing special I can see with the heads.
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Tuned
Joined: Dec 2014
Posts: 455
Likes: 0
well im going to have it bored out to what the cylinder cleans up at, anything more i may end up sleeving depending on how much i have to take off to clean up the bore. no matter what i want to do this up right so it runs a long time. this is an amazing project, i just wish all the farm stuff didn't take up so much time.
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Tuned
Joined: Dec 2014
Posts: 455
Likes: 0
but when you look at it its only .001-.003 before its out of spec. so i'm not sure if i'm just over worried and overthinking it. i just don't want to destroy the fresh rebuild by having to little margin what would be considered in spec so i don't have to pull it all apart shortly after rebuilding it.
Laughing Gas
Joined: Feb 2003
Posts: 1,234
Likes: 3
From: In the woods of Oregon
When things are loose, you just a need a little thicker oil to get higher oil pressure. When things are tight and get hot, that's when you need to worry. Oil doesn't compress, so flow is better than pressure. As long as you have 10psi per 1k, your fine. just my 2cents tho. Others like to see high oil pressure numbers and I guess that's fine too.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
What you typed just doesn't make sense to me, so after I read it the first time I went on to help others whose posts I did understand. Then I came back, got confused again, and left again. And now I've come back again and still don't understand.
If you can help me understand what the situation is with a bit more of an explanation maybe I can offer an opinion.
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Tuned
Joined: Dec 2014
Posts: 455
Likes: 0
One of the reasons I've not commented until now is that I don't understand what you are saying. Are the rod bearing clearances ".001-.003", or are they ".001-.003 in spec"? And is each bearing showing .001 some place and .003 another, meaning they are out of round?
What you typed just doesn't make sense to me, so after I read it the first time I went on to help others whose posts I did understand. Then I came back, got confused again, and left again. And now I've come back again and still don't understand.
If you can help me understand what the situation is with a bit more of an explanation maybe I can offer an opinion.
What you typed just doesn't make sense to me, so after I read it the first time I went on to help others whose posts I did understand. Then I came back, got confused again, and left again. And now I've come back again and still don't understand.
If you can help me understand what the situation is with a bit more of an explanation maybe I can offer an opinion.
So what im trying to figure out is if i should get undersized bearings for the connecting rods or should i get standard. im just worried about how close to out of oem spec that the journals are. i would rather do it right than throw something together just to make it work.
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Tuned
Joined: Dec 2014
Posts: 455
Likes: 0
When things are loose, you just a need a little thicker oil to get higher oil pressure. When things are tight and get hot, that's when you need to worry. Oil doesn't compress, so flow is better than pressure. As long as you have 10psi per 1k, your fine. just my 2cents tho. Others like to see high oil pressure numbers and I guess that's fine too.
. i just want to build the engine so it will last as long as it can without pulling it apart. and i dont think the engine would like thick oil in negative temperatures 
... hahaha
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
If i remember correctly the spec for the connecting rod journal on the crank is 2.3111- 2.3107 my journals were all within the spec by .001- .003. so the first crank journal for the connecting rod was 2.3109. the second journal was 2.3108.
So what im trying to figure out is if i should get undersized bearings for the connecting rods or should i get standard. im just worried about how close to out of oem spec that the journals are. i would rather do it right than throw something together just to make it work.
So what im trying to figure out is if i should get undersized bearings for the connecting rods or should i get standard. im just worried about how close to out of oem spec that the journals are. i would rather do it right than throw something together just to make it work.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
The rods are supposed to be 2.4361-2.4369, which is 2.4365 +/- .0004".
The crank throws are to be 2.3103 - 2.3111, which is 2.3107 +/- .0004".
The desired bearing clearance is .0008-.0015"
The allowable bearing clearance is .0008-.0025"
I think you quoted what the rods are supposed to be rather than what yours are. So my advice is to find out what yours are, and get bearings that bring the clearance within spec.
The crank throws are to be 2.3103 - 2.3111, which is 2.3107 +/- .0004".
The desired bearing clearance is .0008-.0015"
The allowable bearing clearance is .0008-.0025"
I think you quoted what the rods are supposed to be rather than what yours are. So my advice is to find out what yours are, and get bearings that bring the clearance within spec.
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Tuned
Joined: Dec 2014
Posts: 455
Likes: 0
The rods are supposed to be 2.4361-2.4369, which is 2.4365 +/- .0004".
The crank throws are to be 2.3103 - 2.3111, which is 2.3107 +/- .0004".
The desired bearing clearance is .0008-.0015"
The allowable bearing clearance is .0008-.0025"
I think you quoted what the rods are supposed to be rather than what yours are. So my advice is to find out what yours are, and get bearings that bring the clearance within spec.
The crank throws are to be 2.3103 - 2.3111, which is 2.3107 +/- .0004".
The desired bearing clearance is .0008-.0015"
The allowable bearing clearance is .0008-.0025"
I think you quoted what the rods are supposed to be rather than what yours are. So my advice is to find out what yours are, and get bearings that bring the clearance within spec.